German submarine warfare
Subtitle: a study of its methods and spirit, including the crime of the "Lusitania," a record of observations and evidence
By: by Wesley Frost ... with an introduction by Frank Lyon Polk.
Publisher: D. Appleton and company
Published: 1918
Place of publication: New York, London
Language: eng
Number of pages: 243
Subjects: Lusitania (Steamship); World War, 1914-1918 -- Naval operations -- Submarine